Diapositive frame



Dec. 5, 1950' G. LINSER DIAPOSITIVE Filed Feb. 2a, 1948 INVENTOR Patented Dec. 5, 1950 pmrosrrrvnrniinn "Georgi Linse r. Innsbru Application February 2t, 1948, Serial Nail Lien .In Germany April 26, 1,940

I SectionL'Puhlic Law QQD AugnSt'SZi Q IG Ifatent expires April'gfi :1960

3 4 Cities. (01. Eli-#152) the film in any case will be kept plane inside the i ffame ...l i 'l-he 'butting edges of the frentand back walls of the frame elements preferably are-staggered in direction of assemblyand with regard toeach other thusnot only a-dust'and light proof-con- 1 nection of the frame stuck together is--achieved but-also the possibility provided thattdowel pins serviceably -arranged----at-the frame detents are readilyguid'ed -atthe projecting joint edges as the elements -are beingstuck together thus facilitatfngoassembly {MA a.

in order-to secure the frame elements in their position on being handled, i. e. to prevent inadvertent separationin one of the examples of embodiment the prongs of one of the elements formed like aboware divergent and are provided with'projectionsat their freeends which onsticking the frame elements together are catching notches on theother element. n

The drawing is showing several examples of embodiments of the diapositive-framein accordance with this-invention,-viz.:- 1 Fig =1 is a top-view --of the diapositive-frame according-to the first form of embodiment and taken to pieces.

Fig. 2 is a section following the line A-B of Fig. 3 is an end-view of the upper frame element: .7

-51 is an end-view of the lower frame element' and Fig. 5 a section following the line CD of Fig. 4.

Fig. 6 is a top-view of the diapositive-frame according to the second embodiment with the elements separated.

Fig. 7 is a section following the line E-F of Fig. 6.

Fig. 8 is a section following the line G-H of Fi 6.

Fig. 9 shows the upper element of Fig. 6 seen from below and Fig. 10 is an end-view of the lower element.

Fig. 11 is a section of the upper frame element following the line JK of Fig. 9 and Figl 1'21is alsectionlof the lower frame element following-the line L .M Of-Fig. .10. t Fig. 13 is atop-view of a frame with separated eleni-ents and l ...:ig. 14 is a section parallel to the plane of the frame.

Fig. -15:is, a cross section followingthe line A--B ofFig; 13 andv l.

Fig- L6 is a crossslection following thetline.G-,.D

17 shows the upper 'frame' element seen from below and H l Fig. '18 is an endment... .r -Ihe frame consists of. two injection-past .eleinentsaand hof 'Polyamid: or .of asimilar artificial resin suitable for being injected between moulds (plastic) hollow and open inside which elements can be stucktogetheriby displacing them ,onjthe plane of the frameh iT-he elements. should "be as poor a conductor-of heart aspossible;light,ismooth, free fromdust fibresand ridges and. non-hygroscopic.- Theartificial resin v(plastic) used should stand high te'mperaturesand not :warp nor break andtshould--be.=elastic.. A :Witnthe. embodiment ass'hown in Figs. .1 to .5 thetwo -frame elements .a and bare .alike so that they can-be formediin thesamelmoiild. .The' hollow spaces of...the.two .elementsopening inwardly are marked :with..c.. Eachof the elements. .is provided with a-dowel .p'ind and a corresponding entrance .e. At the .inside surface .of .the hollow spaces-stops jandL-guidi'ng stops gfor the panes with film ;are provided. The,:l'ong'itudinal edges g of the guiding stops 9'- run from the walls aslant inwardly (Fig. 2:) Should now the panes with the film be put into the frame, they will be grasped at their edges -andput into the lower frameeleinent b in 1 such a way that one .of the lateraledges will butt at the left side "wall of Fig. land the lower edge against the: tapered ribsg. Now the 'top element a will' be stuck onto the lower element, whereby the dowel pins d enter the openings e and the top edge of the panes with film bear on the stops 1 of the upper frame element.

By inserting the panes with film into the lower frame element b they slide along the sloping edges 9 of the guiding stops g and do the same on sticking the top element onto its mate. With this arrangement the panes with the film are kept together tightly and in jamming tension.

Should on account of differences of thickness of the panes the clearance between the ribs and their mate be smaller than the total thickness iewof lower .ele-

of the two panes with the film the ribs on inserting the set will be scraped by the sharp edges of the panes since the qualities of material of such injected plastics are in accordance therewith and compared with pressed plastics are more elastic too. The greater elasticity has an equalizing or compensating effect and warrants the fixation of the film on a plane.

The meeting faces h and i of the front and rear walls of the frame elements a. and b are staggered in direction of the dowel pin d, i. e. of assembly. Thus not only a dustand light-proof connection of the assembled frame is achieved but there is also a possibility for the dowel pins d on sticking the elements a and b together to readily find a guidance thus facilitating assembly.

The embodiment shown in Figs. 6 to 12 differs from the described one in as much as here the frame elements are not alike. The lower frame element b is given an U-shape and is provided with the dowel pins 11 which fit into openings e of the top element a, shaped like a cap, when this cap will be put on the lower element. For the rest insertion .of the panes with film and assembly of both elements is done in the same way as described before.

The embodiment to Figs. 6-12 compared with that to Figs. 1-5 ofiers the advantage that the panes with film thanks tothe removable cap always will be correctly inserted without requiring special deliberation since it is easy torealize which one is the top element and which one the bottom element. It must not be considered whether the panes with film will be inserted correctly with regard to the edges or not since the cap a is marked accordingly and may be turned round by 180 prior to assembly should it be necessary.

With a further embodiment to Figs. 14-18 the lower frame element b again is given a U-shape the ends of its prongs being fitted with the two dowel pins d which register with the openings e of the upper frame element, the cap a when this is being put on the lower element 1). The stops are marked with f and the guiding stops 9 with the sloping longitudinal edges g are to guide the cover panes. The butting shoulders h and 92 at the front and the rear walls of the frame elements and b are staggered in direction of assembly and with regard of each other.

The prongs of the lower U-element b with the dowel pins diverge in upward direction and are fitted with hooks k at their free ends. According to these hooks 7c notches Z are provided at the side walls of the top element a.

On inserting the cover panes with the film section into the lower frame element b the panes slide on the sloping edges g along the guiding stops 9 and will thus be tightly jammed together.

In order to put on the upper element, the cap a a, the two free elastic prongs of the element b are to be gently' pressed together by grasping them with thumb and forefinger to give these prongs a more parallel position thus allowing the cap a. be easily put on the element b. If now one lets go the prongs of the lower element b the projections k by their elasticity, i. e. of the prongs, will catch the notches l of the cap a thus firmly connecting the two elements a and b in this position. For again separating them a lateral pressure upon the two prongs of the element 1) will do since the hooks is will thus leave the notches Z and the element a can be taken off its mate 1). Instead of hooks projections of any kind may be provided for.

I claim:

1. A diapositive frame preferably for holding together two covering panes with a film between them, comprising two elements in the form of frame members each having interengaging means to assemble the two elements by displacement in the plane of the frame, each element having a U-shaped groove in cross-section opening inwardly of the frame to hold the film and panes in position, the U-shaped grooves each having spaced guide stops in the form of ribs therein with each stop having a wedge surface so formed that they will press the two panes against the film to hold the latter tightly in the frame when the two elements are assembled.

2. A diapositive frame according to claim 1, in which the abutting edges of the frame elements are provided with front and rear walls which are staggered in the direction of assembly of the elements.

3. A diapositive frame according to claim 1, in which the twoelements are made of artificial resin.

4. A diapositive frame according to claim 1, in which one of the elements is formed as a cap member with notches and the other is U-shaped in elevation with a pair of elastic prongs, each with a hook member to engage the respective notch of the cap member to hold the two elements together. 7

GEORG LINSER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,259,434 Blodgett Oct. 21, 1941 2,298,369 Greaves Oct. 13, 1942 2,298,413 Reid Oct. 13, 1942 FOREIGN PATENTS Number Country Date 97,015 Austria May 26, 1924 138,033 Switzerland May 1, 1930 215,992 Switzerland Nov. 1, 1941 465,008 France Jan. 26, 1914 

